Modes of synchronisation around a near-wall oscillating cylinder in streamwise directions

Ju, Xiaoying; An, Hongwei; Cheng, Liang; Tong, Feifei

doi:10.1017/jfm.2020.237

Cited by 3 publications

(3 citation statements)

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“…The cascade of period-doubling and period-halving bifurcations is also observed in the wakes of other bluff bodies and different nonlinear dynamical systems (e.g. Cheng et al 2020;Ju et al 2020), which often signals the transition to chaos (Pikovsky, Rosenblum & Kurths 2003). The cascade of period doubling and period halving for the wake of the cube was detected by using Re = 1.…”

Section: Evolution In Phase Spacementioning

confidence: 83%

See 1 more Smart Citation

Wake transitions behind a cube at low and moderate Reynolds numbers

Meng

Cheng

et al. 2021

J. Fluid Mech.

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Section: Evolution In Phase Spacementioning

confidence: 83%

“…2020; Ju et al. 2020), which often signals the transition to chaos (Pikovsky, Rosenblum & Kurths 2003). The cascade of period doubling and period halving for the wake of the cube was detected by using .…”

Section: Unsteady Flowsmentioning

confidence: 99%

Wake transitions behind a cube at low and moderate Reynolds numbers

Meng

Cheng

et al. 2021

J. Fluid Mech.

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“…In isothermal incompressible flow, many well-documented numerical investigations [15][16][17][18][19][20][21][22][23] had been published to assess the complicated coupling of fluid and structural dynamics. Furthermore, in multibody systems, e.g., side-by-side, [24][25][26][27][28] tandem, [29][30][31] near-wall, [32][33][34] or array 35,36,62 configurations, the interference could be extremely complex and subtly associated with hydrodynamic instabilities. In this study, the primary focus is to study the effect of cross thermal buoyancy and heat convection on the hydrodynamic and structural stability, which are the key aspects in many engineering applications.…”

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confidence: 99%

Secondary lock-in of vortex-induced vibration and energy transfer characteristics of a vibrating cylinder subject to cross buoyancy

Liu

Zhu

2021

Physics of Fluids

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The hydrodynamic and thermal characteristics of a freely vibrating circular cylinder subject to cross buoyancy are numerically investigated at low Reynolds numbers. The structural responses and onset of vortex-induced vibration (VIV) are documented over a range of parameter space, 2:0 reduced velocity (Ur) 10:0; 0:7 Prandtl number (Pr) 10:0 and 0:5 Richardson number (Ri) 2:0. The fluid and structural coefficients are chosen as Reynolds number ðReÞ ¼ 100, mass ratio ðm Ã Þ ¼ 10:0, and damping ratio ðfÞ ¼ 0:01. A phenomenon of secondary VIV lockin is found in the cases of Ri ¼ 2.0 (the cross buoyancy effect becomes influential), Pr . 2:0 and Ur Z 7:0. An extended VIV lock-in region is formed over a wide range of reduced velocity values together with a tremendous kinetic energy transfer between fluid and structure. This finding is significant for the research of hydropower harvesting. On the other hand, the influence of structural dynamics on heat convection over the surface of a heated circular cylinder is recorded and discussed as well. The significance and mutual influence between Prandtl and Richardson numbers on hydrodynamics, structural dynamics, and heat convection are discussed in detail. The temperature contours are found concentrating around the cylinder's surface in the cases of high Prandtl numbers, which are also associated with higher mean Nusselt number (Nu) values. The influence on heat convection over a cylinder's surface is quantified via the computation of Nu and its fluctuation for different circumstances. The energy transfer coefficient is employed to quantify the kinetic energy transfer between the fluid and a heated structure in mixed convective flow. The phase angle difference between the transverse displacement and lift force is used to support the discussions of energy transfer in fluid.

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A numerical study on dynamic flows past three tandem inclined elliptic cylinders near moving wall

Duong,

Nguyen,

Nguyen

et al. 2024

Physics of Fluids

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This numerical study focuses on the dynamic flows past three tandem inclined elliptic cylinders of equal spacing parallel to a moving wall using a lattice Boltzmann method. The gap ratio (G/D=0.6–2.5, where G and D are the gap between the wall surface and cylinder center and major axis, respectively), spacing ratio (L/D=1.5–10, where L is the distance of two adjacent cylinder centers), and inclination angle (α=±15°,±30°,±45°—the angle between normal vector and cylinder's major-axis) are explored at Reynolds number Re = 150 (based on D). The intended analysis links hydrodynamic coefficients, wake structures, and spectral analysis in parameter space of α−G/D−L/D to fluid mechanics. The flow is highly adjustable in this space, dividing into seven regimes: overshoot, continuous reattachment, alternative reattachment, wavy, meandering, quasi-coshedding, and coshedding, which are spatially classified into four modes due to flow interference: shear layer, primary, two-layered, and secondary vortex shedding modes. Transitions between adjacent modes determine three boundaries; and hydrodynamic coefficients differ substantially in parameter space. Due to shadowing, the upstream cylinder has a larger drag coefficient than the middle and downstream cylinders, reducing the drag coefficient of upstream cylinder and the lift coefficient of middle and downstream cylinders. α=±45° has the highest lift oscillation among the three cylinders and a small drag coefficient of the upstream cylinder. The moving wall's proximity effect increases the upstream cylinder's lift coefficient for α<0°, being negligible for high G/D across the full L/D range and stabilizing the lift oscillation of three cylinders.

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Modes of synchronisation around a near-wall oscillating cylinder in streamwise directions

Cited by 3 publications

References 43 publications

Wake transitions behind a cube at low and moderate Reynolds numbers

Wake transitions behind a cube at low and moderate Reynolds numbers

Secondary lock-in of vortex-induced vibration and energy transfer characteristics of a vibrating cylinder subject to cross buoyancy

A numerical study on dynamic flows past three tandem inclined elliptic cylinders near moving wall

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